I found this blog called, "Your OB said what?" and it is hysterical what some of these "professionals" actually say to people. But this one is a flat out lie. All three of my successful vaginal deliveries were standing up in a supported squat - those kiddos never would have come out if I had been lying flat on my back. Gravity - it's a wonderful thing. Make sure to read the comments that smart gals have posted in response to this assinine remark.